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Pedernales River Flood - August 17, 2007

The ground literally moved under my feet from the force of this much water moving over the falls. I was awestruck while shooting some 493 images of this flood. Being able to stand peacefully, just steps away from that much power was bordering on the unbelievable. Images taken Friday, August 17, 2007 from 9:30-10:30 a.m. Peak flow rate (while I was shooting these images) was 84,000 cubic feet per second (approximately 2 acre-feet/second). Flow was 700 cfs at 9pm, just 12 hours before this photo was taken. It rained 11 inches overnight in Fredericksburg and Harper, Texas -- the upper part of the Pedernales River's drainage basin. No rainfall was recorded in the park during the 24 hours preceding this flash flood event.

My father who lived on the Pedernales River in Stonewall, TX called me at 7:30 a.m. to tell me that the river had just reached the 2nd highest level he had ever seen at his property. He thought if I left Austin immediately that I could reach the Pedernales Falls State Park at the crest of the flood. He was correct!
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IMG_2968 - Pedernales Falls Flooding-01
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IMG_2968 - Pedernales Falls Flooding-01

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  • Here's a hydrograph from the USGS streamflow gauge just upstream from the falls.  It shows the flow in the stream channel for the 24 hour period of August 17th.
  • I did not shoot this image, but it allows you to contrast the same view of the falls area when the river is flowing at levels I am familiar with in the dozens of times I've visited the park.<br />
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For reference, let me point out two landmarks so you can compare this view with the next image:  The tall tree on the horizon next to the dead limb hanging down in the upper left corner -- the tree with the hole in it you can see the sky through.  Now there's another tree near the center of the image with a person standing under it in the shade.  You can find those two trees in the next image and a few of the others, and get yourself oriented.  Enjoy the show!
  • During a classic Texas flash-flood event, a river can change to this in just 5 minutes according to the park rangers.  Here on this occassion, Pedernales Falls State Park received no rain for the previous 24 hours and the weather as you can see is fair.  The rain fell an hour's drive upstream -- well out of sight.  If you had camped near the river bank, would you have guessed this would happen?  It's mid-August.  It usually doesn't rain here in August.
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